资料来源 : Webster's Revised Unabridged Dictionary (1913)

Vapor pressure \Vapor pressure\ or tension \tension\ . (Physics)
   The pressure or tension of a confined body of vapor. The
   pressure of a given saturated vapor is a function of the
   temperature only, and may be measured by introducing a small
   quantity of the substance into a barometer and noting the
   depression of the column of mercury.

资料来源 : WordNet®

vapor pressure
     n : the pressure exerted by a vapor; often understood to mean
         saturated vapor pressure (the vapor pressure of a vapor
         in contact with its liquid form) [syn: {vapour pressure}]